Final answer:
The uterus becomes tender to the touch after rupture of a fallopian ectopic pregnancy due to inflammation and possible internal bleeding.
Step-by-step explanation:
The uterus is a key female reproductive organ with a thick muscular wall lined by the endometrium, containing blood vessels and mucus glands. During a medical condition known as ectopic pregnancy, where the fertilized egg implants outside the uterine cavity, most commonly in the fallopian tubes, a rupture can occur. This is a serious medical emergency. If the fallopian tube carrying the ectopic pregnancy ruptures, it will often lead to internal bleeding, irritation of the peritoneum (lining of the abdominal cavity), and a subsequent reaction from the uterus. In response to a rupture of a fallopian ectopic pregnancy, the uterus becomes tender to the touch due to inflammation and potential localized bleeding.